Glad that it is of interest to you I guess you are referring to the ribbon when you ask the periods? Actually, I would rather not detail that particular ribbon here as it is my own development and still under work. But, if it interests you, I will show you here another similar ribbon/rainbow combination that I do still use and which I can detail the content. This ribbon method is certainly nothing new but I evolved it together with some friends. I have written a pdf guide for it which I can link here if this interests you.
These charts have a combination of two ribbons both based on Simple MA's and not EMA's (but the rainbow is still a 15=>50 EMA mixture). All MA's are based on a "typical" calculation (H+L+C/3) which helps smooth the curves. The red/black ribbon is an 8-period SMA and another 8-period shifted forward 1 period. The blue/black ribbon is a 12-period SMA and another 12-period also shifted forward 1 period.
These ribbons work well in trending markets and help keep you in a trade even with a 5m chart. E.g. the example below from 12.4. gave a 50-60 pip trade. Its problem is that it whipsaws in quiet markets and goes like spaghetti - but when the ribbons are overlaid on the rainbow it helps identify which trades are worth taking and which are risky. It is also important to try and keep to active periods in the market (although even on a 1min chart this can scalp a few pips ).
Interestingly, the same model gives quite a good indication of trend on the higher timeframes and I have attached a Daily EURUSD to show this.
Apologies to Moneybaggy if I am stepping on his toes on his thread here, and please remember that this is only intended as a demonstration how MA systems CAN work when combined with complementary indicators.